diff --git a/acme4j-client/src/main/java/org/shredzone/acme4j/challenge/TokenChallenge.java b/acme4j-client/src/main/java/org/shredzone/acme4j/challenge/TokenChallenge.java
index f4881ac0..d5d63c9c 100644
--- a/acme4j-client/src/main/java/org/shredzone/acme4j/challenge/TokenChallenge.java
+++ b/acme4j-client/src/main/java/org/shredzone/acme4j/challenge/TokenChallenge.java
@@ -24,7 +24,6 @@ import org.jose4j.lang.JoseException;
 import org.shredzone.acme4j.Login;
 import org.shredzone.acme4j.exception.AcmeProtocolException;
 import org.shredzone.acme4j.toolbox.JSON;
-import org.shredzone.acme4j.toolbox.JSONBuilder;
 
 /**
  * An extension of {@link Challenge} that handles challenges with a {@code token} and
@@ -35,7 +34,6 @@ public class TokenChallenge extends Challenge {
     private static final long serialVersionUID = 1634133407432681800L;
 
     protected static final String KEY_TOKEN = "token";
-    protected static final String KEY_KEY_AUTHORIZATION = "keyAuthorization";
 
     /**
      * Creates a new generic {@link TokenChallenge} object.
@@ -49,12 +47,6 @@ public class TokenChallenge extends Challenge {
         super(login, data);
     }
 
-    @Override
-    protected void prepareResponse(JSONBuilder response) {
-        super.prepareResponse(response);
-        response.put(KEY_KEY_AUTHORIZATION, getAuthorization());
-    }
-
     /**
      * Gets the token.
      */
diff --git a/acme4j-client/src/test/java/org/shredzone/acme4j/challenge/DnsChallengeTest.java b/acme4j-client/src/test/java/org/shredzone/acme4j/challenge/DnsChallengeTest.java
index fcaf174d..9dd1daef 100644
--- a/acme4j-client/src/test/java/org/shredzone/acme4j/challenge/DnsChallengeTest.java
+++ b/acme4j-client/src/test/java/org/shredzone/acme4j/challenge/DnsChallengeTest.java
@@ -30,8 +30,6 @@ import org.shredzone.acme4j.toolbox.TestUtils;
  * Unit tests for {@link Dns01Challenge}.
  */
 public class DnsChallengeTest {
-    private static final String KEY_AUTHORIZATION =
-            "pNvmJivs0WCko2suV7fhe-59oFqyYx_yB7tx6kIMAyE.HnWjTDnyqlCrm6tZ-6wX-TrEXgRdeNu9G71gqxSO6o0";
 
     private Login login = TestUtils.login();
 
@@ -45,12 +43,12 @@ public class DnsChallengeTest {
         assertThat(challenge.getType(), is(Dns01Challenge.TYPE));
         assertThat(challenge.getStatus(), is(Status.PENDING));
         assertThat(challenge.getDigest(), is("rzMmotrIgsithyBYc0vgiLUEEKYx0WetQRgEF2JIozA"));
+        assertThat(challenge.getAuthorization(), is("pNvmJivs0WCko2suV7fhe-59oFqyYx_yB7tx6kIMAyE.HnWjTDnyqlCrm6tZ-6wX-TrEXgRdeNu9G71gqxSO6o0"));
 
         JSONBuilder response = new JSONBuilder();
         challenge.prepareResponse(response);
 
-        assertThat(response.toString(), sameJSONAs("{\"keyAuthorization\"=\""
-            + KEY_AUTHORIZATION + "\"}").allowingExtraUnexpectedFields());
+        assertThat(response.toString(), sameJSONAs("{}").allowingExtraUnexpectedFields());
     }
 
 }
diff --git a/acme4j-client/src/test/java/org/shredzone/acme4j/challenge/HttpChallengeTest.java b/acme4j-client/src/test/java/org/shredzone/acme4j/challenge/HttpChallengeTest.java
index 2773d2a9..714309fd 100644
--- a/acme4j-client/src/test/java/org/shredzone/acme4j/challenge/HttpChallengeTest.java
+++ b/acme4j-client/src/test/java/org/shredzone/acme4j/challenge/HttpChallengeTest.java
@@ -53,8 +53,7 @@ public class HttpChallengeTest {
         JSONBuilder response = new JSONBuilder();
         challenge.prepareResponse(response);
 
-        assertThat(response.toString(), sameJSONAs("{\"keyAuthorization\"=\""
-            + KEY_AUTHORIZATION + "\"}").allowingExtraUnexpectedFields());
+        assertThat(response.toString(), sameJSONAs("{}").allowingExtraUnexpectedFields());
     }
 
     /**
diff --git a/acme4j-client/src/test/resources/json/triggerHttpChallengeRequest.json b/acme4j-client/src/test/resources/json/triggerHttpChallengeRequest.json
index 8ecbc882..2c63c085 100644
--- a/acme4j-client/src/test/resources/json/triggerHttpChallengeRequest.json
+++ b/acme4j-client/src/test/resources/json/triggerHttpChallengeRequest.json
@@ -1,3 +1,2 @@
 {
-  "keyAuthorization": "IlirfxKKXAsHtmzK29Pj8A.HnWjTDnyqlCrm6tZ-6wX-TrEXgRdeNu9G71gqxSO6o0"
 }
diff --git a/acme4j-client/src/test/resources/json/triggerHttpChallengeResponse.json b/acme4j-client/src/test/resources/json/triggerHttpChallengeResponse.json
index 6845afe5..42ce743d 100644
--- a/acme4j-client/src/test/resources/json/triggerHttpChallengeResponse.json
+++ b/acme4j-client/src/test/resources/json/triggerHttpChallengeResponse.json
@@ -2,6 +2,5 @@
   "type": "http-01",
   "status": "pending",
   "url": "https://example.com/acme/some-location",
-  "token": "IlirfxKKXAsHtmzK29Pj8A",
-  "keyAuthorization": "XbmEGDDc2AMDArHLt5x7GxZfIRv0aScknUKlyf5S4KU.KMH_h8aGAKlY3VQqBUczm1cfo9kaovivy59rSY1xZ0E"
+  "token": "IlirfxKKXAsHtmzK29Pj8A"
 }
diff --git a/acme4j-it/pom.xml b/acme4j-it/pom.xml
index d54f5670..0f31c5c4 100644
--- a/acme4j-it/pom.xml
+++ b/acme4j-it/pom.xml
@@ -132,7 +132,7 @@
                                 <cmd>
                                     <shell>
                                         echo "nameserver $(grep 'bammbamm' /etc/hosts|cut -f1)"&gt;/etc/resolv.conf; \
-                                        pebble -config /etc/pebble/pebble-config.json
+                                        pebble -strict -config /etc/pebble/pebble-config.json
                                     </shell>
                                 </cmd>
                                 <assembly>